Arni glanced out the submarine window. In a few short minutes he'd arrive at his destination, and potentially leave a changed man. Literally. 
It wasn't that the young cheetah disliked his body. It was designed to the specs he gave when he first left the digital cradle where his mind was made. Even so he wanted more, didn't he? He looked fine. Barely in his mid-twenties. A short, auburn mane running down his neck. Something about it though - the way he stood and walked just never felt right.


After disembarking it was a short walk to his destination. The door of his friend and facilitator, Lechi. He rang the bell and before he could utter a word of greeting, the door opened and a purple-haired human pulled him into a tight hug.
"I'm so glad you came!" Lechi exclaimed as he shepherded the nervous Cheetah into his flat. 


Minutes later, both were sipping drinks on the sofa.
"Okay. Time to put the cards on the table."
Lechi produced a small black box and set it between them.
"I got this from a doctor out at the Reefs. Instant tauric lower body. Zero risks. Zero side effects. Or so he says."
"So he says?" Arni frowned.
"Well nanobiology isn't an exact science. Especially when xenofauna interacts with terrestrial organisms. But Doc has a good rep and this stuff wouldn't be legal if it could do any real damage."
The cheetah picked up the small container and turned it in his fingers. A small, silvery capsule tipped with a needle and filled with a milky liquid lay within.
Arni swallowed. This wasn't as simple as a download. What if there were complications that he didn’t like? What if he did like them? Some people say you get the changes you need, not just the ones you want. Maybe just knowing himself would be worth whatever happened?.
"Okay, let's do it. Do you mind me undressing?"


Once the two had cleared away the furniture aside and Arni had stowed his clothes in his rucksack, he took one last look at his lithe body and turned toward Lechi. "So, should I sit or stand or...?"
The human smirked. "Well when I did it I just relaxed in bed, but your change might need a bit more space. Honestly I'd just stand there and go with the flow. Want me to do the injection?"


Arni declined and pushed the needle into his hips, hissing at the sharp pain. In an instant his legs began to give way and he fell to his knees. "Oh damn!"
Lechi jumped up. "Are you okay?"
"Yeah... just... unexpected..." 
Arni became very aware of his tail twitching and started to feel excitement well up within him. The pain had vanished but it felt like his spine was being stretched, taking his rear with it. He closed his eyes and tried to get a feel for what was going on with his body. Now his gut was churning as if his insides had gone on a rollercoaster ride without the rest of him. "Please... hold me. This is weird. Something's weird, I can feel it!"


"Okay Arni, don't freak out now but you're growing extra paws! It's working!" Lechi exclaimed. Arni could feel the touch of the human's fingers on the still-growing limbs emerging from his hips. He sighed in relief, and reached out with his stubby forelimbs trying to hold his friend's hand. It was really happening...


He could feel his spine stretching and growing. New organs were shaping themselves from the nanite goo. It wasn't long before both pairs of paws were pressed firmly against the floor and Arni rolled onto his side so that they could finish growing.
"I think I'm stable... This still feels weird but I think it's good! It's exactly what I wanted!"
Lechi gave Arni a reassuring squeeze. "See! I told you it'd be fine!" He paused, and glanced downwards
"Uhm... But did you always have a six-pack of nipples?"


Arni froze and stared down his chest. Those weren't there before. And they were still growing! 
"Oh no... no nononono!" What else was growing? Would he lose anything? Would that be terrible or good?
A quick squeeze of his hind legs confirmed that his sheath was still there, but his whole lower body tingled with the change so the cheetah couldn't be sure. He gave his new breasts a squeeze, murmuring at the unfamiliar feeling.


"Hey Arni! Look at me!" Lechi lifted the cheetaur's chin and the two locked eyes. "You're gonna be okay. We can change those later if you don't want them.”
Arni nodded, closing his eyes again and breathing in. He could feel it now. His new breasts growing. He gently held them in his hands. Not just the uppermost pair, but the ones below too. They weren't too big thankfully, so maybe it wouldn't be too bad. He gave them another squeeze, making him smile softly. It felt good? He never thought about this before, but this… it felt right.


He felt his lower body finishing out. The only tingles left were right at the back between his ass and his manhood. Arni always knew he'd need a change of wardrobe to go with his new body, but these complications were beyond even what he'd planned for.
"Lechi, when I'm done I'm gonna kick your ass for scaring me like that. But then… I need your help getting used to moving.”
Lechi smiled reassuringly, giving the cheetah a careful hug. “Any way you want. But how do you feel?”
Arni looked down at her chest and back at her lower body. “I was scared at first... but all things considered… I think it’s something I really wanted.” She looked up again to her friend. “And I’m glad you convinced me.”